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| <div class="section" id="fs-unlink"> |
| <h1>fs_unlink<a class="headerlink" href="#fs-unlink" title="Permalink to this headline">¶</a></h1> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span><span class="w"> </span><span class="n">fs_unlink</span><span class="p">(</span><span class="k">const</span><span class="w"> </span><span class="kt">char</span><span class="w"> </span><span class="o">*</span><span class="n">filename</span><span class="p">)</span> |
| </pre></div> |
| </div> |
| <p>Unlinks the file or directory at the specified path. This is the |
| function to use if you want to delete a file or directory from the disk. |
| If the path refers to a directory, all the directory’s descendants are |
| recursively unlinked. Any open file handles referring to an unlinked |
| file remain valid, and can be read from and written to as long as they |
| remain open.</p> |
| <div class="section" id="arguments"> |
| <h2>Arguments<a class="headerlink" href="#arguments" title="Permalink to this headline">¶</a></h2> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 23%" /> |
| <col style="width: 77%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p><em>Argument</em></p></th> |
| <th class="head"><p><em>Description</em></p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>filename</p></td> |
| <td><p>The path of the file or directory to unlink</p></td> |
| </tr> |
| </tbody> |
| </table> |
| </div> |
| <div class="section" id="returned-values"> |
| <h2>Returned values<a class="headerlink" href="#returned-values" title="Permalink to this headline">¶</a></h2> |
| <ul class="simple"> |
| <li><p>0 on success</p></li> |
| <li><p><a class="reference external" href="fs_return_codes.html">FS error code</a> on failure</p></li> |
| </ul> |
| </div> |
| <div class="section" id="header-file"> |
| <h2>Header file<a class="headerlink" href="#header-file" title="Permalink to this headline">¶</a></h2> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="cp">#include</span><span class="w"> </span><span class="cpf">"fs/fs.h"</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example"> |
| <h2>Example<a class="headerlink" href="#example" title="Permalink to this headline">¶</a></h2> |
| <p>The following example creates a file and then immediately unlinks it. By |
| unlinking the file, this function prevents other OS tasks from accessing |
| it. When the function closes the file, it is deleted from the disk.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="kt">int</span> |
| <span class="nf">process_data</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="k">struct</span><span class="w"> </span><span class="nc">fs_file</span><span class="w"> </span><span class="o">*</span><span class="n">file</span><span class="p">;</span> |
| <span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rc</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* If the file doesn't exist, create it. If it does exist, truncate it to</span> |
| <span class="cm"> * zero bytes.</span> |
| <span class="cm"> */</span> |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">fs_open</span><span class="p">(</span><span class="s">"/tmp/buffer.bin"</span><span class="p">,</span><span class="w"> </span><span class="n">FS_ACCESS_WRITE</span><span class="w"> </span><span class="o">|</span><span class="w"> </span><span class="n">FS_ACCESS_TRUNCATE</span><span class="p">,</span><span class="w"> </span><span class="o">&</span><span class="n">file</span><span class="p">);</span> |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* Unlink the file so that other tasks cannot access it. */</span> |
| <span class="w"> </span><span class="n">fs_unlink</span><span class="p">(</span><span class="s">"/tmp/buffer.bin"</span><span class="p">)</span> |
| |
| <span class="w"> </span><span class="cm">/* <use the file as a data buffer> */</span> |
| |
| <span class="w"> </span><span class="cm">/* Close the file. This operation causes the file to be deleted from</span> |
| <span class="cm"> * the disk because it was unlinked earlier (and it has no other open</span> |
| <span class="cm"> * file handles).</span> |
| <span class="cm"> */</span> |
| <span class="w"> </span><span class="n">fs_close</span><span class="p">(</span><span class="n">file</span><span class="p">);</span> |
| <span class="w"> </span><span class="p">}</span> |
| |
| <span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">?</span><span class="w"> </span><span class="mi">0</span><span class="w"> </span><span class="o">:</span><span class="w"> </span><span class="mi">-1</span><span class="p">;</span> |
| <span class="p">}</span> |
| </pre></div> |
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